GitHub - Flickerstrip/SoftwareSPI: A simple library to facilitate bit-banging SPI on any Arduino pins
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Amazon.com: EC Buying FT4232HL 4 Channel USB to Serial Adapter FTDI FT4232 UART SPI I2C JTAG RS485 RS422 RS232 to USB High-Speed Multifunction Serial Adapter Module Support Multi Systems for Windows XP
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